Hi all, I have a question with make_ndx: how can I make a group with residues: 133-136 and 159-163 and 170. Can anyone show me the proper command? Antonio -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://maillist.sys.kth.se/pipermail/gromacs.org_gmx-users/attachments/20091127/47887664/attachment.html>